/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System.Security.Cryptography;
using System.Text;

namespace ASC.Mail.Extensions
{
    public static class StringExtensions
    {
        public static string GetMd5(this string text)
        {
            var bs = Encoding.UTF8.GetBytes(text);
            return bs.GetMd5();
        }

        public static string GetMd5(this byte[] utf8Bytes)
        {
            var x =
                new MD5CryptoServiceProvider();
            var bs = x.ComputeHash(utf8Bytes);
            var s = new StringBuilder(32);
            foreach (var b in bs)
            {
                s.Append(b.ToString("x2").ToLower());
            }
            return s.ToString();
        }

        public static string Prefix(this string str, string prefix)
        {
            return string.IsNullOrEmpty(prefix) ? str : string.Format("{0}.{1}", prefix, str);
        }

        public static string Alias(this string str, string alias)
        {
            return string.IsNullOrEmpty(alias) ? str : string.Format("{0} {1}", str, alias);
        }

        public static string Tabs(int n)
        {
            return new string('\t', n);
        }
    }
}
